A life-threatening sensitivity to an antigen is

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Anaphylaxis is a severe and potentially life-threatening sensitivity to an antigen, such as an allergic reaction to a bee sting or certain foods. Symptoms can include difficulty breathing, swelling of the face and throat, low blood pressure, and severe rash or hives. Immediate emergency medical treatment is necessary to prevent serious complications or death. The other options listed (seizure, cardiac arrest, and respiratory arrest) can also be life-threatening conditions, but do not specifically relate to an antigen sensitivity.

A Life-Threatening Sensitivity to an Antigen Is